Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor

ABSTRACT

An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.

NOTE: More than one reissue application has been filed for the reissueof U.S. Pat. No. 6,614,771. The reissue applications are applicationSer. Nos. 11/218,277, filed Sep. 2, 2005, and the current applicationbeing filed Dec. 6, 2007, which is a continuation reissue application ofapplication Ser. No. 11/218,277.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns an apparatus for making a plurality ofcellular phones randomly access a common channel to transmit data inCDMA (Code Division Multiple Access), and a method therefor.

2. Technical Background

Recently, it has been demanded that the mobile communication system mayprovide data communication services to enable exchanges of moving imageand character data together with those of conventional voicedinformation during movement. IMT-2000 (International MobileTelecommunication-2000) is an international project to develop a mobilecommunication system to enable such data communication services based onan internationally integrated standard. In addition, an effort has beenmade to achieve high speed data transmission with some limitation in themobile characteristics, and particularly, the wireless LAN proposed inIEEE 802.11 standard is commercially able to make data transmission at 2Mbps (Mega bit per sec).

Generally, the circuit-switch, which is employed in the present publicswitched telephone network (PSTN), digital cellular system and personalcommunication system, is not desirable to make such high speed datatransmission because of ineffectively using a limited number ofchannels. In order to resolve the disadvantages of the circuit-switch,the packet-switch has been proposed to make high speed data transmissionin IMT-2000, which is under development for LAN or the standard of thefuture mobile communication system. The band spread method of CDMAapplied to the present digital cellular system has a large communicationcapacity, and is prevented from external tapping and stabilized to makecommunications under the multipath environment generated by the radiochannels rapidly changed through movement, so that it is widely used inthe commercial wireless LAN, CDMA One of LMNQ (Lucent Motorola, Nortel,Qualcomm, Samsung) proposed as the standard of the future IMT-2000, orW-CDMA (Wideband-CDMA) chiefly developed in Europe and Japan.

The future IMT-2000 system is to support both voiced data and packetdata communications. In this case, it is very ineffective that thepacket data is assigned with an exclusive channel as the voiced data.Namely, although the continuous voiced data must be assigned with anexclusive channel, it is desirable for effective use of resources andsimplification of the system that the discontinuous small packet dataare transmitted through the reverse common channels less than the numberof the active terminals. Moreover, if the number of the subscribers isincreased, and thus the amount of the data transmitted, the reversecommon channels must be necessarily used for the effective use ofresources.

The ALOHA method is the most effective way of channel access and datatransmission through the reverse common channel, and a typical randomaccess, which is developed by Hawaii University in 1970 as a protocolfor the wireless network between the islands of Hawaii State. However,such ALOHA suffers the inefficiency of data transmission performedwithout any timed schedule between the base station and terminals, andnetwork overloaded due to frequent collision of data transmitted by anumber of terminals. The slotted ALOHA has been developed to define astandard time between the base station and terminal in order to copewith such problems. This method is to allow the data transmission of aterminal only in a set time, so that the rate of substantial data andthus the transmission efficiency is increased, and the interferencesfrom another terminal is reduced, thereby improving the efficiency ofthe whole network. However, since the slotted ALOHA makes the datatransmission basically in the contention mode, it is impossible to avoidcollisions of data transmitted from the terminals. Hence, if there is anadditional channel for controlling and transmitting information in theforward link from the base station to the terminals, the base stationbroadcasts the information of the received data to the terminals inorder to avoid such data collision.

In the ALOHA system employing CDMA, each terminal uses a different codeor the same code with a time offset to avoid data collision. Inaddition, a preamble signal is firstly transmitted to determine thepower to be used for data transmission, and the initial synchronizationwith the code to use and the tracking of the code synchronization isperformed previous to the data transmission, thereby preventing datatransmission error. Describing the conventional ALOHA protocol employingCDMA in reference to FIG. 1, a terminal makes an access attempt totransmit data. The access attempt consists of a plurality of accesssub-attempts, each of which in turn consists of a plurality of accessprobe sequences, each of which in turn consists of a plurality of accessprobes. The access probe consists of a preamble transmitting a pilotchannel without any substantial information to evaluate the channelsituation and to make the initial synchronization between the codes ofthe terminal and base station and the tracking of the codesynchronization, and an access channel message capsule containing theaccess information or the user's data following the preamble. In orderto transmit an access signal or data through the reverse common channel,a terminal firstly transmits an access probe at a given power level,which must have a minimum value to reduce the interferences affectingthe other terminals that transmit data through an exclusive channel orother reverse common channels. Then, the terminal which made an attemptto transmit data with the first access probe waits for a prescribed timeinterval TA the signal from the base station representing whether thetransmitted data is received. If the first access probe fails to reachthe base station, the terminal makes another attempt to retransmit thesecond probe at a power level increased by a given level PI compared tothe power level of the first probe after a random time interval RT. Ifnot succeeding in the data transmission through a prescribed number ofthe access probes of the first access probe sequence, the terminalperforms the second access probe sequence after passing an additionalrandom time interval RS.

While the conventional ALOHA protocol system employing CDMA can make astable data transmission in the reverse common channel by performingstably the code synchronization and the tracking thereof with thepreamble of a sufficient length even when many data are transmittedthrough the reverse common channel, the preamble is the signal toestablish the code synchronization, and less important and longer thanthe substantial data. Thus, if the synchronization is exactly acquiredin the preamble but with an error in transmission of the substantialdata, the preamble should be retransmitted reducing the datatransmission efficiency.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an apparatus formaking a plurality of cellular phones randomly access a common channelto transmit data in CDMA, which enables the base station to broadcast asignal representing whether it has acquired the synchronization signalof the data received through the reverse common channel or no, so as toprevent the terminals from unnecessarily transmitting data, therebyavoiding interference signals generated in the reverse common channel.

It is another object of the present invention to reduce the power usedin the terminal to employ an exclusive channel or the reverse commonchannel to transmit data, and to enable the failed terminal to quicklyretransmit data.

It is still another object of the present invention to provide anapparatus for making a plurality of cellular phones randomly access acommon channel to transmit data in CDMA, which may stably perform thecode synchronization and the tracking thereof with a preamble of thesame length, and achieve reliable data transmission, and reduce the timetaken for transmitting data.

It is further another object of the present invention to enable the basestation to broadcast the information concerning the state of the channelcard to all terminals in real time so as to prevent the terminals fromunnecessarily transmitting data.

According to the present invention, an apparatus for making a pluralityof terminals have a random access to the reverse common channel of abase station in CDMA, comprises code synchronization detectioninformation broadcast means provided in the base station forbroadcasting the state information of a channel card in real time forthe terminals to recognize the code synchronization detection when thecode synchronization of a certain data is acquired through performingthe code synchronization of the preambles transmitted from the terminalsthrough the reverse common channel, and data transmission determinationmeans provided in the terminals for making the terminals to haveattempted data transmission in the same time slot with the data of thecode synchronization detection continue data transmission and the otherterminals stop data transmission.

According to an aspect of the present invention, each of the terminalscomprises a data generator for generating the data transmitted to thebase station, a data transmitter for transmitting the data generatedfrom the data generator, a terminal RF signal processor for convertingthe data from the data transmitter into an RF signal transmitted to thebase station and for processing an RF signal received from the basestation, a broadcast signal receiver for receiving a broadcast signalfrom the terminal RF signal processor to determine the datatransmission, and data transmission determination circuit forcontrolling the data transmitter to determine whether to make an attemptof transmitting data or to keep on transmitting the data presently undertransmission according to the broadcast signal.

When the data transmission determination circuit receives a broadcastsignal representing the detection of the code synchronization in a timeslot from the base station, it holds the data transmission untilreceiving a broadcast signal representing the code synchronization notacquired when it does not perform data transmission or keeps ontransmitting data when it has attempted the data transmission in thetime slot corresponding to the broadcast signal or stops the datatransmission performed in the time slot not corresponding to thebroadcast signal and holds it until receiving a broadcast signalrepresenting the code synchronization not acquired.

Preferably, the data transmission determination circuit determines thedata transmission by receiving the broadcast signal representing thedetection of the code synchronization in a time slot from the basestation, the data transmission being determined by the first or secondbroadcast signal according as the ratio of the packet length to the slotlength is 2 or 4.

The data transmitter is preferably designed to have a transmitted dataunit consisting of the preamble and user's data, and the power of thepreamble is set different from that of the user's data. The datatransmitter performs the power control according to the power controlbit transmitted after receiving the broadcast signal representing thedetection of the received signal synchronization from the base station,and maintains a constant power level regardless of the power control bittransmitted upon receiving the broadcast signal representing thereceived signal synchronization not acquired from the base station.

The base station preferably comprises a base station RF signal processorfor receiving the RF signal transmitted from the terminal, a datatransceiver for demodulating the signal from the base station RF signalprocessor to deliver it to an upper hierarchy or another network or viceversa, the data transceiver generating a signal representing whether thereceived signal synchronization is acquired or no, a detectiondetermination circuit for receiving the resultant signal of the codesynchronization used to determine whether the received signal isacquired or no upon completing the preamble of the data transmitted fromthe data transceiver, a broadcast determination circuit for determiningthe information to broadcast to the terminals according to the detectionof the received signal synchronization recognized by the detectiondetermination circuit, and a broadcast transmitter for controlling thebase station RF signal processor to transmit the broadcast signaldetermined by the broadcast determination circuit at a prescribed powerlevel in a prescribed time.

Preferably, the detection determination circuit determines the initialcode synchronization and the tracking of the synchronization in a giventime before completion of a preamble transmission to make the terminalsperform the precise operation in the beginning of the slot. In addition,the detection determination circuit searches the codes around thebeginning of each time slot for a duration that may vary from the lengthof the time slot to the length of the preamble.

The broadcast determination circuit determines the broadcast signal onlywith a single bit representing the detection of the synchronization inthe preamble. The broadcast transmitter transmits the broadcast signaldetermined by the broadcast determination circuit through an additionalchannel using a different code other than the presently used code atevery time of completing the slot. Besides, the broadcast transmittertransmits the broadcast signal determined by the broadcast determinationcircuit at every time of completing the slot in the punctured formhaving the power control bit transmitted through the pilot channel and atime offset.

The present invention will now described more specifically withreference to the drawings attached only by way of examples.

BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS

FIG. 1 is a schematic diagram for illustrating the data transmission inALOHA system employing a common channel in conventional CDMA;

FIG. 2 illustrates a CDMA network where the inventive apparatus isapplied;

FIG. 3 is a block diagram for illustrating the base stationcommunicating with the terminal according to the inventive apparatus;

FIG. 4A is a timing diagram for illustrating the random access to thereverse common channel in the inventive apparatus; and

FIG. 4B is a timing diagram for illustrating the random access to thereverse common channel using mini time slots in the inventive apparatus.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIG. 2, the subscriber's terminal 110 transmits a preamblethrough the reverse common channel to the base station, which performsthe code synchronization to receive the data generated from theterminal. CDMA network 300 controls a plurality of base stations 200,210, communicating with other networks. PSTN (Public Switched TelephoneNetwork) 400 also communicates with the CDMA network 300 to connect themobile terminal 110 with the telephone subscriber. Internet 500 alsocommunicates with the CDMA network 300 to connect the terminal 110 withthe Internet subscriber. PSDN (Public Switched Data Network) 600communicates with the CDMA network 300 to connect the terminal 110 withthe PSDN subscriber.

The base station 200 is provided with code synchronization detectioninformation broadcast means for broadcasting the state information of achannel card in real time for the terminals to recognize the codesynchronization detection when the code synchronization of a certaindata is acquired through performing the code synchronization of thepreambles transmitted from the terminals through the reverse commonchannel. In addition, each terminal 100 is provided with datatransmission determination means for making the terminals to haveattempted data transmission in the same time slot with the data of thecode synchronization detection continue data transmission and the otherterminals stop data transmission.

As shown in FIG. 3, the terminal 110 comprise a data generator 111 forgenerating the data transmitted to the base station 210, a datatransmitter 112 for transmitting the data generated from the datagenerator, a terminal RF signal processor 113 for converting the datafrom the data transmitter 112 into an RF signal transmitted to the basestation 210 and for processing an RF signal received from the basestation 210, a broadcast signal receiver 114 for receiving a broadcastsignal from the terminal RF signal processor 113 to determine the datatransmission, and data transmission determination circuit 115 forcontrolling the data transmitter 112 to determine whether to make anattempt of transmitting data or to keep on transmitting the datapresently under transmission according to the broadcast signal.

The base station 210 preferably comprises a base station RF signalprocessor 211 for receiving the RF signal transmitted from the terminal110, a data transceiver 212 for demodulating the signal from the basestation RF signal processor 211 to deliver it to an upper hierarchy oranother network or vice versa, the data transceiver 212 generating asignal representing whether the received signal synchronization isacquired or no, a detection determination circuit 213 for receiving theresultant signal of the code synchronization used to determine whetherthe received signal is acquired or no upon completing the preamble ofthe data transmitted from the data transceiver 212, a broadcastdetermination circuit 214 for determining the information to broadcastto the terminals according to the detection of the received signalsynchronization recognized by the detection determination circuit 213,and a broadcast transmitter 215 for controlling the base station RFsignal processor 211 to transmit the broadcast signal determined by thebroadcast determination circuit 214 at a prescribed power level in aprescribed time.

Describing the operation of the inventive apparatus in connection withFIGS. 3 and 4, the data generator 111 of the terminal 110 generates thedata consisting of a control signal to connect the terminal 110 with thebase station 210 and a substantial data transmitted by the user of theterminal 110. The data may be transmitted through an exclusive channelor the reverse common channel according to the traffic characteristics.In the inventive apparatus, the data is transmitted through the reversecommon channel. The data generated from the data generator is determinedto be transmitted or not according to the broadcast signal received fromthe base station 210.

The hub RF signal processor 211 of the base station 210 converts the RFsignal into the base band signal transmitted to the data transceiver212, which performs the initial code synchronization and the trackingthereof through the preamble of the data received the reverse commonchannel. Generally speaking, while the initial code synchronization andthe tracking thereof may be determined after completing of the preamblereceiving, the probability to achieve the code synchronization may beapproximately evaluated by means of the power of the received signaleven before completion of the preamble receiving, so that the broadcastsignal may be determined prior to completion of the preambletransmission, and therefore the time taken for determining andtransmitting the broadcast signal may be reduced, thus making itpossible to broadcast in real time. Hence, the effect of broadcastingthus determined broadcast signal to all terminals prevents theinterference signals because the other terminals are stopped to transmitdata when the code synchronization has been attained.

Consequently, the base station 210 decodes the data received through thereverse common channel to make an error detection, and broadcasts thesignal representing the detection of the code synchronization of thereceived data to the terminals in real time. Namely, the detectiondetermination circuit 213 transfers the resultant signal of the codesynchronization detection of the received signal from the datatransceiver 212 after completion of the preamble to the broadcastdetermination circuit 214, which determines the preparation todemodulate the data according to the signal from the data transceiver212 representing demodulation such as the signal of the synchronizationdetection and the output signal of the detection determination circuit213.

Then, the broadcast transmitter 215 transmits the informationrepresenting the detection of the code synchronization instead of PCB(Power Control Bit) at the boundary of the time slot in order totransmit in real time the broadcast signal determined by the broadcastdetermination circuit 214 as transmitting PCB through the pilot channel.The possible time delay, as described above, may occur beforetransmission of the preamble, and therefore the prepared broadcastsignal is broadcast before the beginning of the time slot to prevent theperformance degradation.

The terminals 110 determines the subsequent operations depending on theinformation of the code synchronization received from the base station210. When the base station 210 transmits the signal representing thedetection of the code synchronization of the data transmitted throughthe reverse common channel in a specific time slot, the terminals thathave not transmitted data must hold until the completion of transmittingthe acquired data while the terminals that have attempted datatransmission in the corresponding time slot keep on transmitting thedata. Of course, the terminals that have attempted data transmission inthe other time slots must stop the transmission until the completion oftransmitting the acquired data.

FIG. 4A illustrates the example of attempting the data transmissionusing the beginning of the time slot determined by the system time setin the system. In this case, it is assumed that the length of thepreamble necessary for the code synchronization for the datatransmission is twice the data length. The time taken for a single datatransmission consists of a plurality of time slots. The terminal 110including the data newly generated or to be retransmitted before thebeginning of the first time slot S₀ performs the data transmission inthe first time slot interval S₀-S₁. As shown in FIG. 4A, the five dataare simultaneously transmitted, and in the next time slot interval S₁-S₂are transmitted two data through the reverse common channel to the basestation. Hence, the total of the data transmitted in the second timeslot interval is seven.

Firstly, it is assumed that the base station performs the initial codesynchronization and the tracking thereof by detecting one of the fivedata transmitted in the first time slot interval S₀-S₁. This assumptionmay be taken valid because the data are acquired different in powerlevel or transmission delay even if transmitted simultaneously accordingto the distance between the base station 200 and the terminal 110.Therefore, as shown in FIG. 4A, the detection of the data transmitted atthe beginning of the first time slot S₀ is recognized by the basestation 200 at the beginning of the third time slot S₂, transmitted toall the terminals. Then, the terminal 110 determines the next operationaccording to the broadcast signal received through the terminal RFsignal processor 113 and the broadcast signal receiver 114. Namely,receiving the broadcast signal, the terminals that have made the datatransmission at the beginning of the first time slot S₀ keep ontransmitting data, performing closed loop power control by using the PCBtransmitted from this time. Since the previous PCB is invalid due to thepreamble not acquired, the closed loop power control of the preambleprior to broadcasting the synchronization detection signal may causeabrupt change to the power generated from the terminal 110.

In the mean time, the terminals that have made data transmission at timepoints other than the beginning of the first time slot stop thetransmission to attempt retransmission in the time slot at which thenext not acquired signal is transmitted. On the other hand, if thebroadcast signal represents the synchronization not acquired, theterminal does not perform an additional operation, keeping on carryingout the operation done in the previous time slot interval. In this way,the base station may achieve more precise demodulation of the acquireddata because of reduced signal interference, transmitting data in theincreased power without degradation of the overall system performance.Namely, the data acquired from the preamble may be stably demodulated,so that the time taken for the transmission is reduced and thetransmission efficiency is improved.

FIG. 4B illustrates the data transmission procedure where the length ofthe time slot is more reduced. The length of the preamble for the codesynchronization is twice the data length as in FIG. 4A. In this case,each time slot is divided into a plurality of smaller time slots, sothat the number of the terminals 110 is reduced for a time slot. A datais transmitted in the beginning of the first time slot S₀₋₀, and twodata in the beginning of the next time slot S₀₋₁, so that the amount ofthe data transmitted at the beginning of each time slot is reduced, thusincreasing the probability of detecting in the preamble compared to thecase of FIG. 4A.

Consequently, the data transmitted in the second time slot S₀₋₁ isacquired by the base station 200 to broadcast the detection signal tothe terminal 110 in the time slot S₂₋₁ of completing the preamble.Receiving the detection signal, the terminals that have performed datatransmission in the beginning of the second time slot S₀₋₁, keep ontransmitting data while the terminals that have performed datatransmission in the other time slots stop transmission, holding untilthe time slot S₃₋₁ of receiving the signal not acquired from the basestation, and thus the terminals that have not performed datatransmission. Compared to FIG. 4A where two of seven terminals stoptransmission, the five terminals stop data transmission, and thereforeit will be noted that the reduced slot secures the stable datatransmission with reduced signal interference. Thus, the reduced slotlength reduces the probability of transmitting data in the same timeslot, so that there is increased the nubmer of the terminals stoppingunnecessary transmission after detection of the preamble. This increasesthe stability of data transmission, decreasing the signal interferencein the terminals using the exclusive channel or other reverse commonchannels. However, since the signal broadcast from the base station 200to the terminal 110 is determined by the signal received from theterminal, it is required that the slot length is maintained over aprescribed level to minimize the disadvantages caused by thetransmission delay or multi-path. Namely, if the slot length is reducedbelow the prescribed level to reduce the level of the interferencesignal, the performance of the overall system is degraded because ofincreasing the frequency of the signal interference. Hence, it isdesirable to select the slot length that may reduce the level of thesignal interference with minimizing the disadvantages caused by thetransmission delay and multi-path.

In another aspect of the present invention, a method for making aplurality of terminals have a random access to the reverse commonchannel of a base station in CDMA, comprises the steps of broadcastingfrom the base station the state information of a channel card in realtime for the terminals to recognize the code synchronization detectionwhen the code synchronization of a certain data is acquired throughperforming the code synchronization of the preambles transmitted fromthe terminals through the reverse common channel, and making theterminals to have attempted data transmission in the same time slot withthe data of the code synchronization detection continue datatransmission and the other terminals stop data transmission.

Preferably, the step of making the terminals transmit data comprises thesteps of generating the data transmitted to the base station,transmitting the data to the base station, converting the data into anRF signal transmitted to the base station and processing a broadcast RFsignal received from the base station, receiving the converted broadcastRF signal to determine the data transmission, and determining whether tomake an attempt of transmitting data or to keep on transmitting the datapresently under transmission according to the broadcast signal.

Preferably, the step of broadcasting in the base station comprises thesteps of receiving the RF signal transmitted from the terminal,demodulating the signal from the base station RF signal processor todeliver it to an upper hierarchy or another network or vice versa, andgenerating a signal representing whether the received signalsynchronization is acquired or no, receiving the resultant signal of thecode synchronization used to determine whether the received signal isacquired or no upon completing the preamble of the data transmitted,determining the information to broadcast to the terminals according tothe detection of the received signal synchronization, and controllingthe base station to transmit the broadcast signal at a prescribed powerlevel in a prescribed time.

Describing the operation of the inventive method in connection with FIG.4, the data generator of the terminal generates the data consisting of acontrol signal to connect the terminal with the base station and asubstantial data transmitted by the user of the terminal. The datagenerated from the data generator is determined to be transmitted or notaccording to the broadcast signal received from the base station.

The hub RF signal processor of the base station converts the RF signalinto the base band signal transmitted to the data transceiver, whichperforms the initial code synchronization and the tracking thereofthrough the preamble of the data received the reverse common channel.Generally speaking, while the initial code synchronization and thetracking thereof may be determined after completing of the preamblereceiving, the probability to achieve the code synchronization may beapproximately evaluated by means of the power of the received signaleven before completion of the preamble receiving, so that the broadcastsignal may be determined prior to completion of the preambletransmission, and therefore the time taken for determining andtransmitting the broadcast signal may be reduced, thus making itpossible to broadcast in real time. Hence, the effect of broadcastingthus determined broadcast signal to all terminals prevents theinterference signals because the other terminals are stopped to transmitdata when the code synchronization has been attained.

Consequently, the base station 210 decodes the data received through thereverse common channel to make an error detection, and broadcasts thesignal representing the detection of the code synchronization of thereceived data to the terminals in real time. Namely, the detectiondetermination circuit transfers the resultant signal of the codesynchronization detection of the received signal from the datatransceiver after completion of the preamble to the broadcastdetermination circuit, which determines the preparation to demodulatethe data according to the signal from the data transceiver representingdemodulation such as the signal of the synchronization detection and theoutput signal of the detection determination circuit. Then, thebroadcast transmitter transmits the information representing thedetection of the code synchronization instead of PCB at the boundary ofthe time slot in order to transmit in real time the broadcast signaldetermined by the broadcast determination circuit as transmitting PCBthrough the pilot channel.

The terminals determine the subsequent operations depending on theinformation of the code synchronization received from the base station.When the base station transmits the signal representing the detection ofthe code synchronization of the data transmitted through the reversecommon channel in a specific time slot, the terminals that have nottransmitted data must hold until the completion of transmitting theacquired data while the terminals that have attempted data transmissionin the corresponding time slot keep on transmitting the data. Of course,the terminals that have attempted data transmission in the other timeslots must stop the transmission until the completion of transmittingthe acquired data.

FIG. 4A illustrates the example of attempting the data transmissionusing the beginning of the time slot determined by the system time setin the system. Since the preamble and data constitute a transmissiondata unit, the performance depends on the power and length of thepreamble. Hence, if the transmission data unit is greater than twice thetime slot, the inventive effect is achieved, or otherwise, the effectnot obtained. The present invention sets the time slot smaller than theconventional time slot to improve the performance. The time taken for asingle data transmission consists of a plurality of time slots. Theterminal including the data newly generated or to be retransmittedbefore the beginning of the first time slot S₀ performs the datatransmission in the first time slot interval S₀-S₁. As shown in FIG. 4A,the five data are simultaneously transmitted, and in the next time slotinterval S₁-S₂ are transmitted two data through the reverse commonchannel to the base station. Hence, the total of the data transmitted inthe second time slot interval is seven.

Firstly, it is assumed that the base station performs the initial codesynchronization and the tracking thereof by detecting one of the fivedata transmitted in the first time slot interval S₀-S₁. This assumptionmay be taken valid because the data are acquired different in powerlevel or transmission delay even if transmitted simultaneously accordingto the distance between the base station and the terminal. Therefore, asshown in FIG. 4A, the detection of the data transmitted at the beginningof the first time slot S₀ is recognized by the base station at thebeginning of the third time slot S₂, transmitted to all the terminals.Then, the terminal determines the next operation according to thebroadcast signal received through the terminal RF signal processor andthe broadcast signal receiver. Namely, receiving the broadcast signal,the terminals that have made the data transmission at the beginning ofthe first time slot S₀ keep on transmitting data, performing closed looppower control by using the PCB transmitted from this time. Since theprevious PCB is invalid due to the preamble not acquired, the closedloop power control of the preamble prior to broadcasting thesynchronization detection signal may cause abrupt change to the powergenerated from the terminal.

In the mean time, the terminals that have made data transmission at timepoints other than the beginning of the first time slot stop thetransmission to attempt retransmission in the time slot at which thenext signal not acquired is transmitted. On the other hand, if thebroadcast signal represents the synchronization not acquired, theterminal does not perform an additional operation, keeping on carryingout the operation done in the previous time slot interval. In this way,the base station may achieve more precise demodulation of the acquireddata because of reduced signal interference, transmitting data in theincreased power without degradation of the overall system performance.Namely, the data acquired from the preamble may be stably demodulated,so that the time taken for the transmission is reduced and thetransmission efficiency is improved.

FIG. 4B illustrates the data transmission procedure where the length ofthe time slot is more reduced. The length of the preamble for the codesynchronization is twice the data length as in FIG. 4A. In this case,each time slot is divided into a plurality of smaller time slots, sothat the nubmer of the terminals is reduced for a time slot. A data istransmitted in the beginning of the first time slot S₀₋₀, and two datain the beginning of the next time slot S₀₋₁, so that the amount of thedata transmitted at the beginning of each time slot is reduced, thusincreasing the probability of detecting in the preamble compared to thecase of FIG. 4A.

Consequently, the data transmitted in the second time slot S₀₋₁ isacquired by the base station to broadcast the detection signal to theterminal in the time slot S₂₋₁ of completing the preamble. Receiving thedetection signal, the terminals that have performed data transmission inthe beginning of the second time slot S₀₋₁ keep on transmitting datawhile the terminals that have performed data transmission in the othertime slots stop transmission, holding until the time slot S₃₋₁ ofreceiving the signal not acquired from the base station, and thus theterminals that have not performed data transmission. Compared to FIG. 4Awhere two of seven terminals stop transmission, the five terminals stopdata transmission, and therefore it will be noted that the reduced slotsecures the stable data transmission with reduced signal interference.Thus, the reduced slot length reduces the probability of transmittingdata in the same time slot, so that there is increased the nubmer of theterminals stopping unnecessary transmission after detection of thepreamble. This increases the stability of data transmission, decreasingthe signal interference in the terminals using the exclusive channel orother reverse common channels. However, since the signal broadcast fromthe base station to the terminal is determined by the signal receivedfrom the terminal, it is required that the slot length is maintainedover a prescribed level to minimize the disadvantages caused by thetransmission delay or multi-path. Namely, if the slot length is reducedbelow the prescribed level to reduce the level of the interferencesignal, the performance of the overall system is degraded because ofincreasing the frequency of the signal interference. Hence, it isdesirable to select the slot length that may reduce the level of thesignal interference with minimizing the disadvantages caused by thetransmission delay and multi-path

Thus, the base station broadcasts a signal representing the detection ofthe synchronization of the data transmitted through the reverse commonchannel to all terminals to selectively stop unnecessary datatransmission, preventing the reverse common channel from being affectedby the unnecessary signal interference. This reduces the signalinterference in the radio channel to decrease the power used by theterminal performing data transmission through the exclusive or reversecommon channel. In addition, the terminals failed in data transmissionthrough the reverse common channel may expediently performretransmission, reducing delay time. Hence, the inventive apparatus maybe properly applied to a high speed data transmission system such asIMT-2000.

What is claimed is:
 1. An apparatus for making a plurality of terminalshave a random access to the reverse common channel of a base station inCDMA, comprising: code synchronization detection information broadcastmeans provided in said base station for broadcasting the stateinformation of a channel card in real time for said terminals torecognize the code synchronization detection when the codesynchronization of a certain data is acquired through performing thecode synchronization of the preambles transmitted from said terminalsthrough said reverse common channel; and data transmission determinationmeans provided in said terminals for making the terminals to haveattempted data transmission in the same time slot with the data of saidcode synchronization detection continue data transmission and the otherterminals stop data transmission.
 2. An apparatus for making a pluralityof terminals have a random access to the reverse common channel systemin CDMA, as defined in claim 1, wherein each of said terminalscomprises: a data generator for generating the data transmitted to saidbase station; a data transmitter for transmitting said data generatedfrom said data generator; a terminal RF signal processor for convertingsaid data from said data transmitter into an RF signal transmitted tosaid base station and for processing an RF signal received from saidbase station; a broadcast signal receiver for receiving a broadcastsignal from said terminal RF signal processor to determine the datatransmission; and data transmission determination circuit forcontrolling said data transmitter to determine whether to make anattempt of transmitting data or to keep on transmitting the datapresently under transmission according to said broadcast signal.
 3. Anapparatus for making a plurality of terminals have a random access tothe reverse common channel system in CDMA, as defined in claim 2,wherein, when said data transmission determination circuit receives abroadcast signal representing the detection of the code synchronizationin a time slot from said base station, it holds the data transmissionuntil receiving a broadcast signal representing the code synchronizationnot acquired when it does not perform data transmission or keeps ontransmitting data when it has attempted the data transmission in thetime slot corresponding to said broadcast signal or stops the datatransmission performed in the time slot not corresponding to saidbroadcast signal and holds it until receiving a broadcast signalrepresenting the code synchronization not acquired.
 4. An apparatus formaking a plurality of terminals have a random access to the reversecommon channel system in CDMA, as defined in claim 3, wherein said datatransmission determination circuit determines the data transmission byreceiving the broadcast signal representing the detection of the codesynchronization in a time slot from said base station, the datatransmission being determined by the first or second broadcast signalaccording as the ratio of the packet length to the slot length is 2 or4.
 5. An apparatus for making a plurality of terminals have a randomaccess to the reverse common channel system in CDMA, as defined in claim2, wherein said data transmitter is designed to have a transmitted dataunit consisting of the preamble and user's data, and the power of saidpreamble is set different from that of said user's data.
 6. An apparatusfor making a plurality of terminals have a random access to the reversecommon channel system in CDMA, as defined in claim 2, wherein said datatransmitter performs the power control according to the power controlbit transmitted after receiving the broadcast signal representing thedetection of the received signal synchronization from said base station,and maintains a constant power level regardless of the power control bittransmitted upon receiving the broadcast signal representing thereceived signal synchronization not acquired from said base station. 7.An apparatus for making a plurality of terminals have a random access tothe reverse common channel system in CDMA, as defined in claim 1,wherein said base station comprises: a base station RF signal processorfor receiving the RF signal transmitted from the terminal; a datatransceiver for demodulating the signal from said base station RF signalprocessor to deliver it to an upper hierarchy or another network or viceversa, said data transceiver generating a signal representing whetherthe received signal synchronization is acquired or no; a detectiondetermination circuit for receiving the resultant signal of the codesynchronization used to determine whether the received signal isacquired or no upon completing the preamble of the data transmitted fromsaid data transceiver; a broadcast determination circuit for determiningthe information to broadcast to said terminals according to thedetection of the received signal synchronization recognized by saiddetection determination circuit; and a broadcast transmitter forcontrolling said base station RF signal processor to transmit thebroadcast signal determined by said broadcast determination circuit at aprescribed power level in a prescribed time.
 8. An apparatus for makinga plurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 7, wherein said detectiondetermination circuit determines the initial code synchronization andthe tracking of the synchronization in a given time before completion ofa preamble transmission to make said terminals perform the preciseoperation in the beginning of the slot.
 9. An apparatus for making aplurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 8, wherein said detectiondetermination circuit searches the codes around the beginning of eachtime slot for a duration that may vary from the length of the time slotto the length of the preamble.
 10. An apparatus for making a pluralityof terminals have a random access to the reverse common channel systemin CDMA, as defined in claim 7, wherein said broadcast determinationcircuit determines the broadcast signal only with a single bitrepresenting the detection of the synchronization in the preamble. 11.An apparatus for making a plurality of terminals have a random access tothe reverse common channel system in COMA, as defined in claim 7,wherein said broadcast transmitter transmits the broadcast signaldetermined by said broadcast determination circuit through an additionalchannel using a different code other than the presently used code atevery time of completing the slot.
 12. An apparatus for making aplurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 7, wherein said broadcasttransmitter transmits the broadcast signal determined by said broadcastdetermination circuit at every time of completing the slot in thepunctured form having the power control bit transmitted through thepilot channel and a time offset.
 13. An apparatus for making a pluralityof terminals have a random access to the reverse common channel systemin CDMA, as defined in claim 7, wherein said broadcast transmittertransmits the broadcast signal determined by said broadcastdetermination circuit through an additional channel using a differentcode other than the presently use code at the boundary of each timeslot.
 14. A method for making a plurality of terminals have a randomaccess to the reverse common channel of a base station in CDMA,comprising the steps of: broadcasting from said base station the stateinformation of a channel card in real time for said terminals torecognize the code synchronization detection when the codesynchronization of a certain data is acquired through performing thecode synchronization of the preambles transmitted from said terminalsthrough said reverse common channel; and making the terminals to haveattempted data transmission in the same time slot with the data of saidcode synchronization detection continue data transmission and the otherterminals stop data transmission.
 15. A method for making a plurality ofterminals have a random access to the reverse common channel system inCOMA, as defined in claim 14, wherein the step of making the terminalstransmit data comprising the steps of: generating the data transmittedto said base station; transmitting said data to said base station;converting said data into an RF signal transmitted to said base stationand processing a broadcast RF signal received from said base station;receiving the converted broadcast RF signal to determine the datatransmission; and determining whether to make an attempt of transmittingdata or to keep on transmitting the data presently under transmissionaccording to said broadcast signal.
 16. A method for making a pluralityof terminals have a random access to the reverse common channel systemin CDMA, as defined in claim 15, wherein the step of transmissiondetermination comprises the step of holding the data transmission untilreceiving a broadcast signal representing the code synchronization notacquired when it does not perform data transmission or keeps ontransmitting data when it has attempted the data transmission in thetime slot corresponding to said broadcast signal or stops the datatransmission performed in the time slot not corresponding to saidbroadcast signal and holds it until receiving a broadcast signalrepresenting the code synchronization not acquired, when receiving abroadcast signal representing the detection of the code synchronizationin a time slot from said base station.
 17. A method for making aplurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 16, wherein the step oftransmission determination includes the further step of determining thedata transmission by receiving the broadcast signal representing thedetection of the code synchronization in a time slot from said basestation, the data transmission being determined by the first or secondbroadcast signal according as the ratio of the packet length to the slotlength is 2 or
 4. 18. A method for making a plurality of terminals havea random access to the reverse common channel system in CDMA, as definedin claim 15, wherein the step of data transmission has a transmitteddata unit consisting of the preamble and user's data, and the power ofsaid preamble is set different from that of said user's data.
 19. Amethod for making a plurality of terminals have a random access to thereverse common channel system in CDMA, as defined in claim 15, whereinthe step of data transmission performs the power control according tothe power control bit transmitted after receiving the broadcast signalrepresenting the detection of the received signal synchronization fromsaid base station, and maintains a constant power level regardless ofthe power control bit transmitted upon receiving the broadcast signalrepresenting the received signal synchronization not acquired from saidbase station.
 20. A method for making a plurality of terminals have arandom access to the reverse common channel in CDMA, as defined in claim15, wherein the step of broadcasting in said base station comprises thesteps of: receiving the RF signal transmitted from the terminal;demodulating the signal from said base station RF signal processor todeliver it to an upper hierarchy or another network or vice versa, andgenerating a signal representing whether the received signalsynchronization is acquired or no; receiving the resultant signal of thecode synchronization used to determine whether the received signal isacquired or no upon completing the preamble of the data transmitted;determining the information to broadcast to said terminals according tothe detection of the received signal synchronization; and controllingsaid base station to transmit the broadcast signal at a prescribed powerlevel in a prescribed time.
 21. A method for making a plurality ofterminals have a random access to the reverse common channel system inCDMA, as defined in claim 14, wherein the step of broadcasting in saidbase station comprises the steps of: receiving the RF signal transmittedfrom the terminal; demodulating the signal from said base station RFsignal processor to deliver it to an upper hierarchy or another networkor vice versa, and generating a signal representing whether the receivedsignal synchronization is acquired or no; receiving the resultant signalof the code synchronization used to determine whether the receivedsignal is acquired or no upon completing the preamble of the datatransmitted; determining the information to broadcast to said terminalsaccording to the detection of the received signal synchronization; andcontrolling said base station to transmit the broadcast signal at aprescribed power level in a prescribed time.
 22. A method for making aplurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 21, wherein the step ofreceiving the resultant signal determines the initial codesynchronization and the tracking of the synchronization in a given timebefore completion of a preamble transmission to make said terminalsperform the precise operation in the beginning of the slot.
 23. A methodfor making a plurality of terminals have a random access to the reversecommon channel system in CDMA, as defined in claim 22, wherein the stepof receiving the resultant signal searches the codes around thebeginning of each time slot for a duration that may vary from the lengthof the time slot to the length of the preamble.
 24. A method for makinga plurality of terminals have a random access to the reverse commonchannel system in CDMA, as defined in claim 21, wherein the step ofdetermining the information to broadcast determines the broadcast signalonly with a single bit representing the detection of the synchronizationin the preamble.
 25. A method for making a plurality of terminals have arandom access to the reverse common channel system in CDMA, as definedin claim 21, wherein the step of controlling said base station transmitsthe broadcast signal through using a different code other than thepresently used code at every time of completing the slot.
 26. A methodfor making a plurality of terminals have a random access to the reversecommon channel system in CDMA, as defined in claim 21, wherein the stepof controlling said base station transmits the broadcast signal at everytime of completing the slot in the punctured form having the powercontrol bit transmitted through the pilot channel and a time offset. 27.A method for making a plurality of terminals have a random access to thereverse common channel system in CDMA, as defined in claim 21, whereinthe step of controlling said base station transmits the broadcast signalthrough using a different code other than the presently used code at theboundary of each time slot.
 28. An apparatus for making a plurality ofterminals have a random access to the reverse common channel of a basestation in CDMA, comprising: code synchronization detection informationbroadcast means provided in said base station for broadcasting the stateinformation of a channel card in real time for said terminals torecognize the code synchronization detection when the codesynchronization of a certain data is acquired through performing thecode synchronization of the preambles transmitted from said terminalsthrough said reverse common channel; and data transmission determinationmeans provided in said terminals for making the terminals to haveacquired the code synchronization of the transmitted preambles in saidbase station continue data transmission and the other terminals stopdata transmission, wherein each of said terminals comprises: a datagenerator for generating the data transmitted to said base station; adata transmitter for transmitting said data generated from said datagenerator; a terminal RF signal processor for converting said data fromsaid data transmitter into an RF signal transmitted to said base stationand for processing an RF signal received from said base station; abroadcast signal receiver for receiving a broadcast signal from saidterminal RF signal processor to determine data transmission; and datatransmission determination circuit for controlling said data transmitterto determine whether to make an attempt of transmitting data or to keepon transmitting the data presently under transmission according to saidbroadcast signal, wherein, when said data transmission determinationcircuit receives a broadcast signal representing the detection of thecode synchronization in a time slot from said base station, it holds thedata transmission until receiving a broadcast signal representing thecode synchronization not acquired when it does not perform datatransmission or keeps on transmitting data when it has attempted thedata transmission in the time slot corresponding to said broadcastsignal or stops the data transmission performed in the time slot notcorresponding to said broadcast signal and holds it until receiving abroadcast signal representing the code synchronization not acquired. 29.An apparatus for making a plurality of terminals have a random access tothe reverse common channel of a base station in CDMA, comprising: codesynchronization detection information broadcast means provided in saidbase station for broadcasting the state information of a channel card inreal time for said terminals to recognize the code synchronizationdetection when the code synchronization of a certain data is acquiredthrough performing the code synchronization of the preambles transmittedfrom said terminals through said reverse common channel; and datatransmission determination means provided in said terminals for makingthe terminals to have acquired the code synchronization of thetransmitted preambles in said base station continue data transmissionand the other terminals stop data transmission, wherein each of saidterminals comprises: a data generator for generating the datatransmitted to said base station; a data transmitter for transmittingsaid data generated from said data generator; a terminal RF signalprocessor for converting said data from said data transmitter into an RFsignal transmitted to said base station and for processing an RF signalreceived from said base station; a broadcast signal receiver forreceiving a broadcast signal from said terminal RF signal processor todetermine the data transmission; and data transmission determinationcircuit for controlling said data transmitter to determine whether tomake an attempt of transmitting data or to keep on transmitting the datapresently under transmission according to said broadcast signal, whereinsaid data transmitter is designed to have a transmitted data unitconsisting of the preamble and user's data, and the power of saidpreamble is set different from that of said user's data.
 30. Anapparatus for making a plurality of terminals have a random access tothe reverse common channel of a base station in CDMA, comprising: codesynchronization detection information broadcast means provided in saidbase station for broadcasting the state information of a channel card inreal time for said terminals to recognize the code synchronizationdetection when the code synchronization of a certain data is acquiredthrough performing the code synchronization of the preambles transmittedfrom said terminals through said reverse common channel; and datatransmission determination means provided in said terminals for makingthe terminals to have acquired the code synchronization of thetransmitted preambles in said base station continue data transmissionand the other terminals stop data transmission, wherein said basestation comprises: a base station RF signal processor for receiving theRF signal transmitted from the terminal; a data transceiver fordemodulating the signal from said base station RF signal processor todeliver it to an upper hierarchy or another network or vice versa, saiddata transceiver generating a signal representing whether the receivedsignal synchronization is acquired or no; a detection determinationcircuit for receiving the resultant signal of the code synchronizationused to determine whether the received signal is acquired or no uponcompleting the preamble of the data transmitted from said datatransceiver; a broadcast determination circuit for determining theinformation to broadcast to said terminals according to the detection ofthe received signal synchronization recognized by said detectiondetermination circuit; and a broadcast transmitter for controlling saidbase station RF signal processor to transmit the broadcast signaldetermined by said broadcast determination circuit at a prescribed powerlevel in a prescribed time.
 31. A method for making a plurality ofterminals have a random access to the reverse common channel of a basestation in CDMA, comprising the steps of: broadcasting from said basestation the state information of a channel card in real time for saidterminals to recognize the code synchronization detection when the codesynchronization of a certain data is acquired through performing thecode synchronization of the preambles transmitted from said terminalsthrough said reverse common channel; and making the terminals to haveacquired the code synchronization of the transmitted preambles in saidbase station continue data transmission and the other terminals stopdata transmission, wherein the step of making the terminals transmitdata comprising the steps of: generating the data transmitted to saidbase station; transmitting said data to said base station; convertingsaid data into an RF signal transmitted to said base station andprocessing a broadcast RF signal received from said base station;receiving the converted broadcast RF signal to determine the datatransmission; and determining whether to make an attempt of transmittingdata or to keep on transmitting the data presently under transmissionaccording to said broadcast signal, wherein the step of transmissiondetermination comprises the step of holding the data transmission untilreceiving a broadcast signal representing the code synchronization notacquired when it does not perform data transmission or keeps ontransmitting data when it has attempted the data transmission in thetime slot corresponding to said broadcast signal or stops the datatransmission performed in the time slot not corresponding to saidbroadcast signal and holds it until receiving a broadcast signalrepresenting the code synchronization not acquired, when receiving abroadcast signal representing the detection of the code synchronizationin a time slot from said base station.
 32. A method for making aplurality of terminals have a random access to the reverse commonchannel of a base station in CDMA, comprising the steps of: broadcastingfrom said base station the state information of a channel card in realtime for said terminals to recognize the code synchronization detectionwhen the code synchronization of a certain data is acquired throughperforming the code synchronization of the preambles transmitted fromsaid terminals through said reverse common channel; and making theterminals to have acquired the code synchronization of the transmittedpreambles in said base station continue data transmission and the otherterminals stop data transmission, wherein the step of making theterminals transmit data comprising the steps of: generating the datatransmitted to said base station; transmitting said data to said basestation; converting said data into an RF signal transmitted to said basestation and processing a broadcast RF signal received from said basestation; receiving the converted broadcast RF signal to determine thedata transmission; and determining whether to make an attempt oftransmitting data or to keep on transmitting the data presently undertransmission according to said broadcast signal, wherein the step ofdata transmission has a transmitted data unit consisting of the preambleand user's data, and the power of said preamble is set different fromthat of said user's data.
 33. A method for making a plurality ofterminals have a random access to the reverse common channel of a basestation in CDMA, comprising the steps of: broadcasting from said basestation the state information of a channel card in real time for saidterminals to recognize the code synchronization detection when the codesynchronization of a certain data is acquired through performing thecode synchronization of the preambles transmitted from said terminalsthrough said reverse common channel; and making the terminals to haveacquired the code synchronization of the transmitted preambles in saidbase station continue data transmission and the other terminals stopdata transmission, wherein the step of broadcasting in said base stationcomprises the steps of: receiving the RF signal transmitted from theterminal; demodulating the signal from said base station RF signalprocessor to deliver it to an upper hierarchy or another network or viceversa, and generating a signal representing whether the received signalsynchronization is acquired or no; receiving the resultant signal of thecode synchronization used to determine whether the received signal isacquired or no upon completing the preamble of the data transmitted;determining the information to broadcast to said terminals according tothe detection of the received signal synchronization; and controllingsaid base station to transmit the broadcast signal at a prescribed powerlevel in a prescribed time.
 34. An apparatus for transmitting a datapacket to a base station in a code division multiple access (CDMA)telecommunication system wherein a plurality of terminals randomlyaccess to a reverse common channel, comprising: means for receivingstate information broadcasted from the base station, the stateinformation representing that a code synchronization of the data packetis acquired in the base station, wherein a code synchronizationdetection is performed based on a preamble of the data packettransmitted from the terminals through the reverse common channel; anddata transmission determination means for determining whether the codesynchronization of the data packet is acquired or not based on the stateinformation, allowing the terminal to transmit the data packet in thesame time slot as the data packet of which the code synchronization isacquired if the code synchronization of the data packet is acquired, andallowing the terminal to stop transmission of the data packets if thecode synchronization of the data packet is not acquired.
 35. A terminalfor transmitting a data packet to a base station in a code divisionmultiple access (CDMA) telecommunication system wherein a plurality ofterminals randomly access to a reverse common channel, comprising: adata generator for generating data packets to be transmitted to the basestation; a data transmitter for transmitting the data packets generatedin said data generator; a terminal RF signal processor for convertingthe data packets from said data transmitter into a radio frequency (.RF)signal and for processing an RF signal received from the base station; abroadcast signal receiver for receiving a broadcast signal from saidterminal RF signal processor, the broadcast signal representing that acode synchronization of the data packet is acquired in the base station,wherein a code synchronization detection is performed based on apreamble of the data packet transmitted from the terminals through thereverse common channel; and data transmission determination circuit fordetermining whether the code synchronization of the data packet isacquired or not based on the broadcast signal, allowing the datatransmitter to continue to transmit the data packet if the codesynchronization of the data packet is acquired, and allowing the datatransmitter to stop transmission of the data packets if the codesynchronization of the data packet is not acquired.
 36. The terminal asrecited in claim 35, wherein the data transmitter is designed to have atransmitted data unit consisting of the preamble and user's data, andthe power of the preamble is set different from that of the user's data.37. A base station for making a plurality of terminals have a randomaccess to a reverse common channel in a code division multiple access(CDMA) system, comprising: a base station RF signal processor forreceiving an RF signal transmitted from the terminal; a data transceiverfor demodulating the RF signal from said base station RF signalprocessor and generating a data packet to deliver it to an upperhierarchy or another network or vice versa, generating a signalrepresenting whether a code synchronization of the data packet isacquired or not; a detection determination means for determining whetherthe data packet is acquired or not upon completing a preamble of thedata packet; a broadcast determination means for determining informationrepresenting that the code synchronization of the data packet isacquired, to be broadcasted to the terminals if the code synchronizationof the data packet is acquired; and a broadcast transmitter forcontrolling the information representing that the code synchronizationof the data packet is acquired, to be broadcasted to the terminals at apredetermined power level in a predetermined time.
 38. The base stationas recited in claim 37, wherein said detection determination meansdetermines the initial code synchronization and the tracking of thesynchronization in a given time before completion of a preambletransmission to make said terminals perform the precise operation in thebeginning of the slot.
 39. The base station as recited in claim 37,wherein said detection determination means searches the codes around thebeginning of each time slot for a duration that may vary from the lengthof the time slot to the length of the preamble.
 40. The base station asrecited in claim 39, wherein said broadcast determination meansdetermines the broadcast signal only with a single bit representing thedetection of the synchronization in the preamble.
 41. The base stationas recited in claim 39, wherein said broadcast transmitter transmits thebroadcast signal determined by said broadcast determination meansthrough an additional channel using a different code other than thepresently used code at every time of completing the slot.
 42. The basestation as defined in claim 39, wherein said broadcast transmittertransmits the broadcast signal determined by said broadcastdetermination means at every time of completing the slot in thepunctured form having the power control bit transmitted through thepilot channel and a time offset.
 43. A method for transmitting a datapacket to a base station in a code division multiple access (CDMA)telecommunication system wherein a plurality of terminals randomlyaccess to a reverse common channel, comprising the steps of: a)receiving state information broadcasted from the base station, the stateinformation representing that a code synchronization of the data packetis acquired in the base station, wherein a code synchronizationdetection is performed based on a preamble of the data packettransmitted from the terminals through the reverse common channel; andb) determining whether the code synchronization of the data packet isacquired or not based on the state information, allowing the terminal totransmit the data packet in the same time slot as the data packet ofwhich the code synchronization is acquired if the code synchronizationof the data packet is acquired, and allowing the terminal to stoptransmission of the data packets if the code synchronization of the datapacket is not acquired.
 44. A method for transmitting a data packet to abase station in a code division multiple access (CDMA) telecommunicationsystem wherein a plurality of terminals randomly access to a reversecommon channel, comprising the steps of: a) at a data generator,generating data packets to be transmitted to the base station; b) at adata transmitter, transmitting the data packets generated in the datagenerator; c) at a terminal RF signal processor, converting the datapackets into a radio frequency (RF) signal and for processing an RFsignal received from the base station; d) at a broadcast signalreceiver, receiving a broadcast signal from said terminal RF signalprocessor, the broadcast signal representing that a code synchronizationof the data packet is acquired in the base station, wherein a codesynchronization detection is performed based on a preamble of the datapacket transmitted from the terminals through the reverse commonchannel; and e) at data transmission determination means, determiningwhether the code synchronization of the data packet is acquired or notbased on the broadcast signal, allowing the data transmitter to continueto transmit the data packet if the code synchronization of the datapacket is acquired, and allowing the data transmitter to stoptransmission of the data packets if the code synchronization of the datapacket is not acquired.
 45. The method as recited in claim 44, whereinthe data packet includes the preamble and user's data, and the power ofthe preamble is set different from that of the user's data.
 46. A methodfor making a plurality of terminals have a random access to a reversecommon channel in a code division multiple access (CDMA) system,comprising: a) at a base station RF signal processor, receiving an RFsignal transmitted from the terminal; b) at a data transceiver,demodulating the RF signal from said base station RF signal processorand generating a data packet to deliver it to an upper hierarchy oranother network or vice versa, generating a signal representing whethera code synchronization of the data packet is acquired or not; c) at adetection determination means, determining whether the data packet isacquired or not upon completing a preamble of the data packet; d) at abroadcast determination means, determining information representing thatthe code synchronization of the data packet is acquired, to bebroadcasted to the terminals if the code synchronization of the datapacket is acquired; and d) at a broadcast transmitter, for controllingthe information representing that the code synchronization of the datapacket is acquired, to be broadcasted to the terminals at apredetermined power level in a predetermined time.
 47. The method asrecited in claim 46, wherein in the step c) the codes are searchedaround the beginning of each time slot for a duration that may vary fromthe length of the time slot to the length of the preamble.
 48. A methodfor transmitting a first user data from a first user equipment in a codedivision multiple access (CDMA) telecommunication system comprising:transmitting in a first time slot a first preamble associated with thefirst user data; receiving a broadcast signal broadcasted from a basestation, wherein the broadcast signal is received at a specific timethat is a predetermined time interval after the first time slot, whereinthe predetermined time interval is at least the length of the firstpreamble; and determining, based on the broadcast signal, whether or notto transmit the first user data.
 49. The method of claim 48, wherein thefirst user data comprises a control signal and substantial data.
 50. Themethod of claim 48, further comprising transmitting the first user databased on the determination.
 51. The method of claim 50, wherein thefirst preamble and first user data are transmitted using a reversecommon channel.
 52. The method of claim 50, wherein the first user datais transmitted in a second time slot, and wherein the second time slotis a predetermined number of time slots after the first time slot. 53.The method of claim 52, wherein after the transmission of the firstpreamble in the first time slot, the first user equipment determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 54. The method of claim 52, wherein thebroadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 55.The method of claim 52, wherein the broadcast signal is received only atthe specific time.
 56. The method of claim 52, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 57. The method of claim 50, wherein the firstpreamble is transmitted at a power level that differs from the powerlevel at which at least a portion of the first user data is transmitted.58. The method of claim 48, wherein the broadcast signal is broadcastedfrom the base station in response to the first preamble.
 59. The methodof claim 48, further comprising retransmitting the first preamble whenthe determination is to not transmit the first user data.
 60. The methodof claim 48, further comprising continuing transmission by transmittingthe first user data when the determination is to transmit the first userdata.
 61. The method of claim 60, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 62. The method of claim 60,wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 63. The method of claim 60, wherein the broadcast signalis received only at the specific time.
 64. The method of claim 60,wherein the broadcast signal that causes the transmission of the firstuser data is received only at the specific time.
 65. The method of claim48, further comprising transmitting the first user data when thedetermination is to transmit the first user data, wherein transmissionof the first user data occurs in a second time slot after the specifictime in which the broadcast signal is received.
 66. The method of claim65, wherein after transmission of the first preamble in the first timeslot, the first user equipment determines to transmit the first userdata solely based on the broadcast signal received at the specific time.67. The method of claim 48, wherein the broadcast signal is determinedby the base station and represents that a code synchronization of a datapacket is acquired.
 68. The method of claim 67, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 69. The method ofclaim 67, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 70. The method of claim 67, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 71. The method of claim 67, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 72. The method of claim 48, wherein the broadcast signalrepresents whether a code synchronization was acquired in the basestation, wherein the code synchronization represents detection of asignal by the base station.
 73. The method of claim 72, wherein afterthe transmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 74. The method ofclaim 72, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 75. The method of claim 72, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 76. The method of claim 72, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 77. The method of claim 48, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 78. The method of claim 77, wherein the broadcast signalis broadcasted from the base station in response to a second preambletransmitted by a second user equipment in the first time slot.
 79. Themethod of claim 78, wherein after the transmission of the first preamblein the first time slot, the first user equipment determines to transmitthe first user data solely based on the broadcast signal received at thespecific time.
 80. The method of claim 77, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 81. The method ofclaim 77, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 82. The method of claim 77, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 83. The method of claim 77, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 84. The method of claim 48, wherein the first preamble isindistinctive between at least two user equipments including the firstuser equipment.
 85. The method of claim 84, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 86. The method ofclaim 48, wherein after the transmission of the first preamble in thefirst time slot, the first user equipment determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 87. The method of claim 48, wherein the broadcast signalthat makes the first user equipment determine to transmit the first userdata is received only at the specific time.
 88. The method of claim 48,further comprising transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 89. The method of claim48, further comprising transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 90. An apparatus for transmitting a firstuser data from a first user equipment in a code division multiple access(CDMA) telecommunication system comprising: a transmitter configured totransmit in a first time slot a first preamble associated with the firstuser data; a signal receiver configured to receive a broadcast signalbroadcasted from a base station, wherein the broadcast signal isreceived at a specific time that is a predetermined time interval afterthe first time slot, wherein the predetermined time interval is at leastthe length of the first preamble; and a transmission determination unitconfigured to determine, based on the broadcast signal, whether or notto transmit the first user data, wherein the transmitter is furtherconfigured to transmit the first user data when the transmissiondetermination unit determines to transmit the first user data.
 91. Theapparatus of claim 90, wherein the first preamble and first user dataare transmitted using a reverse common channel.
 92. The apparatus ofclaim 90, wherein the first user data comprises a control signal andsubstantial data.
 93. The apparatus of claim 90, wherein the first userdata is transmitted in a second time slot, and wherein the second timeslot is a predetermined number of time slots after the first time slot.94. The apparatus of claim 93, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationunit determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 95. The apparatus ofclaim 93, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 96. The apparatus of claim 93, wherein the broadcastsignal is received only at the specific time.
 97. The apparatus of claim93, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 98. The apparatusof claim 90, wherein the first preamble is transmitted at a power levelthat differs from the power level at which at least a portion of thefirst user data is transmitted.
 99. The apparatus of claim 90, whereinthe broadcast signal is broadcasted from the base station in response tothe first preamble.
 100. The apparatus of claim 90, wherein thetransmitter is further configured to retransmit the first preamble. 101.The apparatus of claim 90, wherein the transmitter is further configuredto continue transmission by transmitting the first user data when thetransmission determination unit determines to transmit the first userdata.
 102. The apparatus of claim 101, wherein after the transmission ofthe first preamble in the first time slot, the transmissiondetermination unit determines to transmit the first user data solelybased on the broadcast signal received at the specific time.
 103. Theapparatus of claim 101, wherein the broadcast signal that makes thefirst user equipment determine to transmit the first user data isreceived only at the specific time.
 104. The apparatus of claim 101,wherein the broadcast signal is received only at the specific time. 105.The apparatus of claim 101, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 106. The apparatus of claim 90, wherein transmission of the firstuser data occurs in a second time slot after the specific time in whichthe broadcast signal is received.
 107. The apparatus of claim 106,wherein after the transmission of the first preamble in the first timeslot, the transmission determination unit determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 108. The apparatus of claim 90, wherein the broadcastsignal is determined by the base station and represents that a codesynchronization of a data packet is acquired.
 109. The apparatus ofclaim 108, wherein after the transmission of the first preamble in thefirst time slot, the transmission determination unit determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 110. The apparatus of claim 108, whereinthe broadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 111.The apparatus of claim 108, wherein the broadcast signal is receivedonly at the specific time.
 112. The apparatus of claim 108, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 113. The apparatus of claim 90,wherein the broadcast signal represents whether a code synchronizationwas acquired in the base station, wherein the code synchronizationrepresents detection of a signal by the base station.
 114. The apparatusof claim 113, wherein after the transmission of the first preamble inthe first time slot, the transmission determination unit determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 115. The apparatus of claim 113, whereinthe broadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 116.The apparatus of claim 113, wherein the broadcast signal is receivedonly at the specific time.
 117. The apparatus of claim 113, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 118. The apparatus of claim 90,wherein the broadcast signal is indistinctive between at least two userequipments including the first user equipment.
 119. The apparatus ofclaim 118, wherein after the transmission of the first preamble in thefirst time slot, the transmission determination unit determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 120. The apparatus of claim 118, whereinthe broadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 121.The apparatus of claim 118, wherein the broadcast signal is receivedonly at the specific time.
 122. The apparatus of claim 118, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 123. The apparatus of claim 118,wherein the broadcast signal is broadcasted from the base station inresponse to a second preamble transmitted by a second user equipment inthe first time slot.
 124. The apparatus of claim 123, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination unit determines to transmit the first userdata solely based on the broadcast signal received only at the specifictime.
 125. The apparatus of claim 90, wherein the first preamble isindistinctive between at least two user equipments including the firstuser equipment.
 126. The apparatus of claim 125, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination unit determines to transmit the first userdata solely based on the broadcast signal received at the specific time.127. The apparatus of claim 90, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationunit determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 128. The apparatus ofclaim 90, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 129. The apparatus of claim 90, wherein the broadcastsignal is received only at the specific time.
 130. The apparatus ofclaim 90, wherein the broadcast signal that causes the transmission ofthe first user data is received only at the specific time.
 131. A systemfor transmitting a first user data from a first user equipment in a codedivision multiple access (CDMA) telecommunication system comprising: atransmission module operable to transmit in a first time slot a firstpreamble associated with the first user data; a signal receiving moduleoperable to receive a broadcast signal broadcasted from a base station,wherein the broadcast signal is received at a specific time that is apredetermined time interval after the first time slot, wherein thepredetermined time interval is at least the length of the firstpreamble; and a transmission determination module operable to determine,based on the broadcast signal, whether or not to transmit the first userdata, wherein the transmission module is further operable to transmitthe first user data when the transmission determination moduledetermines to transmit the first user data.
 132. The system of claim131, wherein the first preamble and first user data are transmittedusing a reverse common channel.
 133. The system of claim 131, whereinthe first user data comprises a control signal and substantial data.134. The system of claim 131, wherein the first user data is transmittedin a second time slot, and wherein the second time slot is apredetermined number of time slots after the first time slot.
 135. Thesystem of claim 134, wherein after the transmission of the firstpreamble in the first time slot, the transmission determination moduledetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 136. The system of claim 134,wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 137. The system of claim 134, wherein the broadcastsignal is received only at the specific time.
 138. The system of claim134, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 139. The systemof claim 131, wherein the first preamble is transmitted at a power levelthat differs from the power level at which at least a portion of thefirst user data is transmitted.
 140. The system of claim 131, whereinthe broadcast signal is broadcasted from the base station in response tothe first preamble.
 141. The system of claim 131, wherein thetransmission module is further operable to retransmit the firstpreamble.
 142. The system of claim 131, wherein the transmission moduleis further operable to continue transmission by transmitting the firstuser data when the transmission determination module determines totransmit the first user data.
 143. The system of claim 142, whereinafter the transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.144. The system of claim 142, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 145. The system of claim 142,wherein the broadcast signal is received only at the specific time. 146.The system of claim 142, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 147. The system of claim 131, wherein transmission of the firstuser data occurs in a second time slot after the specific time in whichthe broadcast signal is received.
 148. The system of claim 147, whereinafter the transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.149. The system of claim 131, wherein the broadcast signal is determinedby the base station and represents that a code synchronization of a datapacket is acquired.
 150. The system of claim 149, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.151. The system of claim 149, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 152. The system of claim 149,wherein the broadcast signal is received only at the specific time. 153.The system of claim 149, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 154. The system of claim 131, wherein the broadcast signalrepresents whether a code synchronization was acquired in the basestation, wherein the code synchronization represents detection of asignal by the base station.
 155. The system of claim 154, wherein afterthe transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.156. The system of claim 154, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 157. The system of claim 154,wherein the broadcast signal is received only at the specific time. 158.The system of claim 154, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 159. The system of claim 131, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 160. The system of claim 159, wherein the broadcastsignal is broadcasted from the base station in response to a secondpreamble transmitted by a second user equipment in the first time slot.161. The system of claim 160, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationmodule determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 162. The system of claim159, wherein after the transmission of the first preamble in the firsttime slot, the transmission determination module determines to transmitthe first user data solely based on the broadcast signal received at thespecific time.
 163. The system of claim 159, wherein the broadcastsignal that makes the first user equipment determine to transmit thefirst user data is received only at the specific time.
 164. The systemof claim 159, wherein the broadcast signal is received only at thespecific time.
 165. The system of claim 159, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 166. The system of claim 131, wherein thefirst preamble is indistinctive between at least two user equipmentsincluding the first user equipment.
 167. The system of claim 166,wherein after the transmission of the first preamble in the first timeslot, the transmission determination module determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 168. The system of claim 131, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.169. The system of claim 131, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 170. The system of claim 131,wherein the broadcast signal is received only at the specific time. 171.The system of claim 131, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 172. A recording device operating with a processor to executecomputer-executable instructions stored in the recording device toperform a method for transmitting a first user data from a first userequipment in a code division multiple access (CDMA) telecommunicationsystem, the method comprising: transmitting in a first time slot a firstpreamble associated with the first user data; receiving a broadcastsignal broadcasted from a base station, wherein the broadcast signal isreceived at a specific time that is a predetermined time interval afterthe first time slot, wherein the predetermined time interval is at leastthe length of the first preamble; and determining, based on thebroadcast signal, whether or not to transmit the first user data. 173.The recording device of claim 172, wherein the first user data comprisesa control signal and substantial data.
 174. The recording device ofclaim 172, wherein the method further comprises transmitting the firstuser data based on the determination.
 175. The recording device of claim174, wherein the first preamble and first user data are transmittedusing a reverse common channel.
 176. The recording device of claim 174,wherein the first user data is transmitted in a second time slot, whichis a predetermined number of time slots after the first time slot. 177.The recording device of claim 176, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 178. The recording device of claim176, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 179. The recording device of claim 176, wherein thebroadcast signal is received only at the specific time.
 180. Therecording device of claim 176, wherein the broadcast signal that causesthe transmission of the first user data is received only at the specifictime.
 181. The recording device of claim 174, wherein the first preambleis transmitted at a power level that differs from the power level atwhich at least a portion of the first user data is transmitted.
 182. Therecording device of claim 172, wherein the broadcast signal isbroadcasted from the base station in response to the first preamble.183. The recording device of claim 172, wherein the method furthercomprises retransmitting the first preamble when the determination is tonot transmit the first user data.
 184. The recording device of claim172, wherein the method further comprises continuing transmission bytransmitting the first user data when the determination is to transmitthe first user data.
 185. The recording device of claim 184, whereinafter the transmission of the first preamble in the first time slot, thefirst user equipment determines to transmit the first user data solelybased on the broadcast signal received at the specific time.
 186. Therecording device of claim 184, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 187. The recording device of claim184, wherein the broadcast signal is received only at the specific time.188. The recording device of claim 184, wherein the broadcast signalthat causes the transmission of the first user data is received only atthe specific time.
 189. The recording device of claim 172, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein transmissionof the first user data occurs in a second time slot after the specifictime in which the broadcast signal is received.
 190. The recordingdevice of claim 189, wherein after the transmission of the firstpreamble in the first time slot, the first user equipment determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 191. The recording device of claim 172,wherein the broadcast signal is determined by the base station andrepresents that a code synchronization of a data packet is acquired.192. The recording device of claim 191, wherein after the transmissionof the first preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 193. The recording device of claim191, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 194. The recording device of claim 191, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 195. The recording deviceof claim 191, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 196. Therecording device of claim 172, wherein the broadcast signal representswhether a code synchronization was acquired in the base station, whereinthe code synchronization represents detection of a signal by the basestation.
 197. The recording medium of claim 196, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 198. Therecording device of claim 196, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 199. The recording device of claim196, wherein the method further comprises transmitting the first userdata when the determination is to transmit the first user data, whereinthe broadcast signal is received only at the specific time.
 200. Therecording device of claim 196, wherein the method further comprisestransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 201. The recording device of claim 172, wherein the broadcastsignal is indistinctive between at least two user equipments includingthe first user equipment.
 202. The recording device of claim 201,wherein the broadcast signal is broadcasted from the base station inresponse to a second preamble transmitted by a second user equipment inthe first time slot.
 203. The recording device of claim 202, whereinafter the transmission of the first preamble in the first time slot, thefirst user equipment determines to transmit the first user data solelybased on the broadcast signal received at the specific time.
 204. Therecording device of claim 201, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 205. The recording device of claim201, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 206. The recording device of claim 201, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 207. The recording deviceof claim 201, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 208. Therecording device of claim 172, wherein the first preamble isindistinctive between at least two user equipments including the firstuser equipment.
 209. The recording device of claim 208, wherein afterthe transmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 210. Therecording device of claim 172, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 211. The recording medium of claim172, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 212. The recording medium of claim 172, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 213. The recording mediumof claim 172, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 214. A method fortransmitting a first user data from a first user equipment in a codedivision multiple access (CDMA) telecommunication system comprising:transmitting in a first time slot a first preamble associated with thefirst user data; receiving a broadcast signal broadcasted from a basestation, wherein the broadcast signal is received at a specific timethat is a predetermined time interval after the beginning of the firsttime slot, wherein the predetermined time interval is at least thelength of the first preamble; and determining, based on the broadcastsignal, whether or not to transmit the first user data.
 215. The methodof claim 214, wherein the first user data comprises a control signal andsubstantial data.
 216. The method of claim 214, further comprisingtransmitting the first user data based on the determination.
 217. Themethod of claim 216, wherein the first preamble and first user data aretransmitted using a reverse common channel.
 218. The method of claim216, wherein the first user data is transmitted in a second time slot,and wherein the second time slot is a predetermined number of time slotsafter the first time slot.
 219. The method of claim 218, wherein afterthe transmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 220. The methodof claim 218, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 221. The method of claim 218, wherein the broadcastsignal is received only at the specific time.
 222. The method of claim218, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 223. The methodof claim 216, wherein the first preamble is transmitted at a power levelthat differs from the power level at which at least a portion of thefirst user data is transmitted.
 224. The method of claim 214, whereinthe broadcast signal is broadcasted from the base station in response tothe first preamble.
 225. The method of claim 214, further comprisingretransmitting the first preamble when the determination is to nottransmit the first user data.
 226. The method of claim 214, furthercomprising continuing transmission by transmitting the first user datawhen the determination is to transmit the first user data.
 227. Themethod of claim 226, wherein after the transmission of the firstpreamble in the first time slot, the first user equipment determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 228. The method of claim 226, wherein thebroadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 229.The method of claim 226, wherein the broadcast signal is received onlyat the specific time.
 230. The method of claim 226, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 231. The method claim 214, furthercomprising transmitting the first user data when the determination is totransmit the first user data, wherein transmission of the first userdata occurs in a second time slot after the specific time in which thebroadcast signal is received.
 232. The method of claim 231, whereinafter the transmission of the first preamble in the first time slot, thefirst user equipment determines to transmit the first user data solelybased on the broadcast signal received at the specific time.
 233. Themethod of claim 214, wherein the broadcast signal is determined by thebase station and represents that a code synchronization of a data packetis acquired.
 234. The method of claim 233, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 235. The methodof claim 233, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 236. The method of claim 233, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 237. The method of claim 233, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 238. The method of claim 214, wherein the broadcast signalrepresents whether a code synchronization was acquired in the basestation, wherein the code synchronization represents detection of asignal by the base station.
 239. The method of claim 238, wherein afterthe transmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 240. The methodof claim 238, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 241. The method of claim 238, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 242. The method of claim 238, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 243. The method of claim 214, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 244. The method of claim 243, wherein the broadcastsignal is broadcasted from the base station in response to a secondpreamble transmitted by a second user equipment in the first time slot.245. The method of claim 244, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 246. The method of claim 243,wherein after the transmission of the first preamble in the first timeslot, the first user equipment determines to transmit the first userdata solely based on the broadcast signal received at the specific time.247. The method of claim 243, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 248. The method of claim 243,further comprising transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 249. The method of claim243, further comprising transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 250. The method of claim 214, wherein thefirst preamble is indistinctive between at least two user equipmentsincluding the first user equipment.
 251. The method of claim 250,wherein after the transmission of the first preamble in the first timeslot, the first user equipment determines to transmit the first userdata solely based on the broadcast signal received at the specific time.252. The method of claim 214, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 253. The method of claim 214,wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 254. The method of claim 214, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 255. The method of claim 214, further comprisingtransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 256. An apparatus for transmitting a first user data from a firstuser equipment in a code division multiple access (CDMA)telecommunication system comprising: a transmitter configured totransmit in a first time slot a first preamble associated with the firstuser data; a signal receiver configured to receive a broadcast signalbroadcasted from a base station, wherein the broadcast signal isreceived at a specific time that is a predetermined time interval afterthe beginning of the first time slot, wherein the predetermined timeinterval is at least the length of the first preamble; and atransmission determination unit configured to determine, based on thebroadcast signal, whether or not to transmit the first user data,wherein the transmitter is further configured to transmit the first userdata when the transmission determination unit determines to transmit thefirst user data.
 257. The apparatus of claim 256, wherein the firstpreamble and first user data are transmitted using a reverse commonchannel.
 258. The apparatus of claim 256, wherein the first user datacomprises a control signal and substantial data.
 259. The apparatus ofclaim 256, wherein the first user data is transmitted in a second timeslot, and wherein the second time slot is a predetermined number of timeslots after the first time slot.
 260. The apparatus of claim 259,wherein after the transmission of the first preamble in the first timeslot, the transmission determination unit determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 261. The apparatus of claim 259, wherein the broadcastsignal that makes the first user equipment determine to transmit thefirst user data is received only at the specific time.
 262. Theapparatus of claim 259, wherein the broadcast signal is received only atthe specific time.
 263. The apparatus of claim 259, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 264. The apparatus of claim 256,wherein the first preamble is transmitted at a power level that differsfrom the power level at which at least a portion of the first user datais transmitted.
 265. The apparatus of claim 256, wherein the broadcastsignal is broadcasted from the base station in response to the firstpreamble.
 266. The apparatus of claim 256, wherein the transmitter isfurther configured to retransmit the first preamble.
 267. The apparatusof claim 256, wherein the transmitter is further configured to continuetransmission by transmitting the first user data when the transmissiondetermination unit determines to transmit the first user data.
 268. Theapparatus of claim 267, wherein after the transmission of the firstpreamble in the first time slot, the transmission determination unitdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 269. The apparatus of claim 267,wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 270. The apparatus of claim 267, wherein the broadcastsignal is received only at the specific time.
 271. The apparatus ofclaim 267, wherein the broadcast signal causes the transmission of thefirst user data is received only at the specific time.
 272. Theapparatus of claim 256, wherein transmission of the first user dataoccurs in a second time slot after the specific time in which thebroadcast signal is received.
 273. The apparatus of claim 272, whereinafter the transmission of the first preamble in the first time slot, thetransmission determination unit determines to transmit the first userdata solely based on the broadcast signal received at the specific time.274. The apparatus of claim 256, wherein the broadcast signal isdetermined by the base station and represents that a codesynchronization of a data packet is acquired.
 275. The apparatus ofclaim 274, wherein after the transmission of the first preamble in thefirst time slot, the transmission determination unit determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 276. The apparatus of claim 274, whereinthe broadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 277.The apparatus of claim 274, wherein the broadcast signal is receivedonly at the specific time.
 278. The apparatus of claim 274, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 279. The apparatus of claim 256,wherein the broadcast signal represents whether a code synchronizationwas acquired in the base station, wherein the code synchronizationrepresents detection of a signal by the base station.
 280. The apparatusof claim 279, wherein after the transmission of the first preamble inthe first time slot, the transmission determination unit determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 281. The apparatus of claim 279, whereinthe broadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 282.The apparatus of claim 279, wherein the broadcast signal is receivedonly at the specific time.
 283. The apparatus of claim 279, wherein thebroadcast signal that causes the transmission of the first user data isreceived only at the specific time.
 284. The apparatus of claim 256,wherein the broadcast signal is indistinctive between at least two userequipments including the first user equipment.
 285. The apparatus ofclaim 284, wherein the broadcast signal is broadcasted from the basestation in response to a second preamble transmitted by a second userequipment in the first time slot.
 286. The apparatus of claim 285,wherein after the transmission of the first preamble in the first timeslot, the transmission determination unit determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 287. The apparatus of claim 284, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination unit determines to transmit the first userdata solely based on the broadcast signal received at the specific time.288. The apparatus of claim 284, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 289. The apparatus of claim 284,wherein the broadcast signal is received only at the specific time. 290.The apparatus of claim 284, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 291. The apparatus of claim 256, wherein the first preamble isindistinctive between at least two user equipments including the firstuser equipment.
 292. The apparatus of claim 291, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination unit determines to transmit the first userdata solely based on the broadcast signal received at the specific time.293. The apparatus of claim 256, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationunit determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 294. The apparatus ofclaim 256, wherein the broadcast signal that makes the first userequipment determine to transmit the first user data is received only atthe specific time.
 295. The apparatus of claim 256, wherein thebroadcast signal is received only at the specific time.
 296. Theapparatus of claim 256, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 297. A system for transmitting a first user data from a first userequipment in a code division multiple access (CDMA) telecommunicationsystem comprising: a transmission module operable to transmit in a firsttime slot a first preamble associated with the first user data; a signalreceiving module operable to receive a broadcast signal broadcasted froma base station, wherein the broadcast signal is received at a specifictime that is a predetermined time interval after the beginning of thefirst time slot, wherein the predetermined time interval is at least thelength of the first preamble; and a transmission determination moduleoperable to determine, based on the broadcast signal, whether or not totransmit the first user data, wherein the transmission module is furtheroperable to transmit the first user data when the transmissiondetermination module determines to transmit the first user data. 298.The system of claim 297, wherein the first preamble and first user dataare transmitted using a reverse common channel.
 299. The system of claim297, wherein the first user data comprises a control signal andsubstantial data.
 300. The system of claim 297, wherein the first userdata is transmitted in a second time slot, and wherein the second timeslot is a predetermined number of time slots after the first time slot.301. The system of claim 300, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationmodule determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 302. The system of claim300, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 303. The system of claim 300, wherein the broadcastsignal is received only at the specific time.
 304. The system of claim300, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 305. The systemof claim 297, wherein the first preamble is transmitted at a power levelthat differs from the power level at which at least a portion of thefirst user data is transmitted.
 306. The system of claim 297, whereinthe broadcast signal is broadcasted from the base station in response tothe first preamble.
 307. The system of claim 296, wherein thetransmission module is further operable to retransmit the firstpreamble.
 308. The system of claim 297, wherein the transmission moduleis further operable to continue transmission by transmitting the firstuser data when the transmission determination module determines totransmit the first user data.
 309. The system of claim 308, whereinafter the transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.310. The system of claim 308, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 311. The system of claim 308,wherein the broadcast signal is received only at the specific time. 312.The system of claim 308, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 313. The system of claim 297, wherein transmission of the firstuser data occurs in a second time slot after the specific time in whichthe broadcast signal is received.
 314. The system of claim 313, whereinafter the transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.315. The system of claim 297, wherein the broadcast signal is determinedby the base station and represents that a code synchronization of a datapacket is acquired.
 316. The system of claim 315, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.317. The system of claim 315, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 318. The system of claim 315,wherein the broadcast signal is received only at the specific time. 319.The system of claim 315, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 320. The system of claim 297, wherein the broadcast signalrepresents whether a code synchronization was acquired in the basestation, wherein the code synchronization represents detection of asignal by the base station.
 321. The system of claim 320, wherein afterthe transmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.322. The system of claim 320, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 323. The system of claim 320,wherein the broadcast signal is received only at the specific time. 324.The system of claim 320, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 325. The system of claim 297, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 326. The system of claim 325, wherein the broadcastsignal is broadcasted from the base station in response to a secondpreamble transmitted by a second user equipment in the first time slot.327. The system of claim 326, wherein after the transmission of thefirst preamble in the first time slot, the transmission determinationmodule determines to transmit the first user data solely based on thebroadcast signal received at the specific time.
 328. The system of claim325, wherein after the transmission of the first preamble in the firsttime slot, the transmission determination module determines to transmitthe first user data solely based on the broadcast signal received at thespecific time.
 329. The system of claim 325, wherein the broadcastsignal that makes the first user equipment determine to transmit thefirst user data is received only at the specific time.
 330. The systemof claim 325, wherein the broadcast signal is received only at thespecific time.
 331. The system of claim 325, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 332. The system of claim 297, wherein thefirst preamble is indistinctive between at least two user equipmentsincluding the first user equipment.
 333. The system of claim 332,wherein after the transmission of the first preamble in the first timeslot, the transmission determination module determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 334. The system of claim 297, wherein after thetransmission of the first preamble in the first time slot, thetransmission determination module determines to transmit the first userdata solely based on the broadcast signal received at the specific time.335. The system of claim 297, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 336. The system of claim 297,wherein the broadcast signal is received only at the specific time. 337.The system of claim 297, wherein the broadcast signal that causes thetransmission of the first user data is received only at the specifictime.
 338. A recording device operating with a processor to executecomputer-executable instructions stored in the recording device toperform a method for transmitting a first user data from a first userequipment in a code division multiple access (CDMA) telecommunicationsystem, the method comprising: transmitting in a first time slot a firstpreamble associated with the first user data; receiving a broadcastsignal broadcasted from a base station, wherein the broadcast signal isreceived at a specific time that is a predetermined time interval afterthe beginning of the first time slot, wherein the predetermined timeinterval is at least the length of the first preamble; and determining,based on the broadcast signal, whether or not to transmit the first userdata.
 339. The recording device of claim 338, wherein the first userdata comprises a control signal and substantial data.
 340. The recordingdevice of claim 338, wherein the method further comprises transmittingthe first user data based on the determination.
 341. The recordingdevice of claim 340, wherein the first preamble and first user data aretransmitted using a reverse common channel.
 342. The recording device ofclaim 340, wherein the first user data is transmitted in a second timeslot, which is a predetermined number of time slots after the first timeslot.
 343. The recording device of claim 342, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 344. Therecording device of claim 342, wherein the broadcast signal that makesthe first user equipment determine to transmit the first user data isreceived only at the specific time.
 345. The recording device of claim342, wherein the broadcast signal is received only at the specific time.346. The recording device of claim 342, wherein the broadcast signalthat causes the transmission of the first user data is received only atthe specific time.
 347. The recording device of claim 340, wherein thefirst preamble is transmitted at a power level that differs from thepower level at which at least a portion of the first user data istransmitted.
 348. The recording device of claim 338, wherein thebroadcast signal is broadcasted from the base station in response to thefirst preamble.
 349. The recording device of claim 338, wherein themethod further comprises retransmitting the first preamble when thedetermination is to not transmit the first user data.
 350. The recordingdevice of claim 338, wherein the method further comprises continuingtransmission by transmitting the first user data when the determinationis to transmit the first user data.
 351. The recording device of claim350, wherein after the transmission of the first preamble in the firsttime slot, the first user equipment determines to transmit the firstuser data solely based on the broadcast signal received at the specifictime.
 352. The recording device of claim 350, wherein the broadcastsignal that makes the first user equipment determine to transmit thefirst user data is received only at the specific time.
 353. Therecording device of claim 350, wherein the broadcast signal is receivedonly at the specific time.
 354. The recording device of claim 350,wherein the broadcast signal that causes the transmission of the firstuser data is received only at the specific time.
 355. The recordingdevice of claim 338, wherein the method further comprises transmittingthe first user data when the determination is to transmit the first userdata, wherein transmission of the first user data occurs in a secondtime slot after the specific time in which the broadcast signal isreceived.
 356. The recording device of claim 355, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 357. Therecording device of claim 338, wherein the broadcast signal isdetermined by the base station and represents that a codesynchronization of a data packet is acquired.
 358. The recording deviceof claim 357, wherein after the transmission of the first preamble inthe first time slot, the first user equipment determines to transmit thefirst user data solely based on the broadcast signal received at thespecific time.
 359. The recording device of claim 357, wherein thebroadcast signal that makes the first user equipment determine totransmit the first user data is received only at the specific time. 360.The recording device of claim 357, wherein the method further comprisestransmitting the first user data when the determination is to transmitthe first user data, wherein the broadcast signal is received only atthe specific time.
 361. The recording device of claim 357, wherein themethod further comprises transmitting the first user when thedetermination is to transmit the first user data, wherein the broadcastsignal that causes the transmission of the first user data is receivedonly at the specific time.
 362. The recording device of claim 338,wherein the broadcast signal represents whether a code synchronizationwas acquired in the base station, wherein the code synchronizationrepresents detection of a signal by the base station.
 363. The recordingdevice of claim 362, wherein after the transmission of the firstpreamble in the first time slot, the first user equipment determines totransmit the first user data solely based on the broadcast signalreceived at the specific time.
 364. The recording device of claim 362,wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 365. The recording device of claim 362, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 366. The recording deviceof claim 362, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 367. Therecording device of claim 338, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 368. The recording device of claim 367, wherein thebroadcast signal is broadcasted from the base station in response to asecond preamble transmitted by a second user equipment in the first timeslot.
 369. The recording device of claim 368, wherein after thetransmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 370. Therecording device of claim 367, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 371. The recording device of claim367, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 372. The recording device of claim 367, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 373. The recording deviceof claim 367, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 374. Therecording device of claim 338, wherein the first preamble isindistinctive between at least two user equipments including the firstuser equipment.
 375. The recording medium of claim 374, wherein afterthe transmission of the first preamble in the first time slot, the firstuser equipment determines to transmit the first user data solely basedon the broadcast signal received at the specific time.
 376. Therecording device of claim 338, wherein after the transmission of thefirst preamble in the first time slot, the first user equipmentdetermines to transmit the first user data solely based on the broadcastsignal received at the specific time.
 377. The recording device of claim338, wherein the broadcast signal that makes the first user equipmentdetermine to transmit the first user data is received only at thespecific time.
 378. The recording device of claim 338, wherein themethod further comprises transmitting the first user data when thedetermination is to transmit the first user data, wherein the broadcastsignal is received only at the specific time.
 379. The recording deviceof claim 338, wherein the method further comprises transmitting thefirst user data when the determination is to transmit the first userdata, wherein the broadcast signal that causes the transmission of thefirst user data is received only at the specific time.
 380. A method fortransmitting a first user data from a first user equipment in a codedivision multiple access (CDMA) telecommunication system comprising:transmitting in a first time slot a first preamble associated with thefirst user data using a reverse common channel; receiving a broadcastsignal broadcasted from a base station; and determining, based on thebroadcast signal, whether or not to transmit the first user data,wherein the broadcast signal which causes the first user equipment totransmit the first user data is received only at a specific time that isa predetermined time interval after the beginning of the first timeslot, and wherein the predetermined time interval is at least the lengthof the first preamble.
 381. The method of claim 380, wherein thebroadcast signal causes a second user equipment to transmit second userdata.
 382. The method of claim 381, wherein the broadcast signalrepresents whether a code synchronization was acquired.
 383. The methodof claim 380, wherein the broadcast signal is indistinctive between atleast two user equipments including the first user equipment.
 384. Themethod of claim 380, wherein the first preamble is indistinctive betweenat least two user equipments including the first user equipment. 385.The method of claim 380, wherein the broadcast signal represents whethera code synchronization was acquired.
 386. An apparatus for transmittinga first user data from a first user equipment in a code divisionmultiple access (CDMA) telecommunication system comprising: atransmitter configured to transmit in a first time slot a first preambleassociated with the first user data using a reverse common channel; asignal receiver configured to receive a broadcast signal broadcastedfrom a base station; and a transmission determination unit coupled tothe signal receiver and the transmitter and configured to determine, onthe broadcast signal, whether or not to transmit the first user data,wherein the transmitter is further configured to transmit the first userdata when the transmission determination unit determines to transmit thefirst user data, wherein the broadcast signal which causes the firstuser equipment to transmit the first user data is received only at aspecific time that is a predetermined time interval after the beginningof the first time slot, and wherein the predetermined time interval isat least the length of the first preamble.
 387. The apparatus of claim386, wherein the broadcast signal causes a second user equipment totransmit second user data.
 388. The apparatus of claim 387, wherein thebroadcast signal represents whether a code synchronization was acquired.389. The apparatus of claim 386, wherein the broadcast signal isindistinctive between at least two user equipments including the firstuser equipment.
 390. The apparatus of claim 386, wherein the firstpreamble is indistinctive between at least two user equipments includingthe first user equipment.
 391. The apparatus of claim 386, wherein thebroadcast signal represents whether a code synchronization was acquired.